I've had the luck that these last few years, while I've been really digging into jazz, I've had stores near me that keep it well-stocked. Last year not quite as much, had to shop around a little bit, but there's an amazing music store here in Bonn, one of the better ones I've ever seen, and it has a five or six metre long jazz section downstairs. The large percentage of the classic albums are there somewhere. I've never gone looking for an album there and not found it.